<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style> #canvas, #video { float: left; margin-right: 10px; background: #fff;
} .box { overflow: hidden; margin-bottom: 10px;
}
</style>
</head>
<body>
<div class="box">
<video id="video" width="400" height="400"></video>
<canvas id="canvas"></canvas>
</div>
<button id="live">直播</button>
<button id="snap">截图</button>
<script>
var video = document.getElementById('video'); var canvas = document.getElementById('canvas'); var ctx = canvas.getContext('2d'); var width = video.width; var height = video.height; canvas.width = width; canvas.height = height; function liveVideo() { var URL = window.URL || window.webkitURL; // 获取到window.URL对象
navigator.getUserMedia({ video: true }, function(stream) { video.src = URL.createObjectURL(stream); // 将获取到的视频流对象转换为地址
video.play(); // 播放
//点击截图
document.getElementById("snap").addEventListener('click', function() { ctx.drawImage(video, 0, 0, width, height); var url = canvas.toDataURL('image/png'); document.getElementById('download').href = url; }); }, function(error) { console.log(error.name || error); }); } document.getElementById("live").addEventListener('click', function() { liveVideo(); }); </script>
</body>
</html>
